What's listed as the 18th issue slot card in the guide from Bronco Billy's Casino in Cripple Creek has a red border around the "MVP Club" on the front which is sort of unique as all the other slot cards from there have a white border. Well there appears to be another variation of that particular card that has "01" on the reverse in the upper right corner above the mag stripe. Everything else on the two variations are identical.

Scans will be on the ChipGuide as soon as Albert has time to add it.